What should I do if the flu recurs with fever?

Written by Yuan Qing

Pulmonology

Updated on February 03, 2025

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Influenza, also known as the flu, refers to a disease characterized primarily by sore throat, cough, and fever, caused by an influenza virus infection of the upper respiratory tract during the flu season. Due to the repeated replication of the influenza virus after entering the human body, it triggers an immune response between the person and the virus, thus causing repeated fevers.

However, for a person with normal immunity, the flu can improve on its own, usually over 7 to 10 days. During these 7 to 10 days, if the fever recurs, it can be managed with some antipyretic medicines. Both traditional Chinese medicine and Western medicine have relevant drugs. After the fever subsides, the flu can usually heal on its own within about 3 to 5 days.

(Please use medication under the guidance of a doctor.)

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Written by Wang Chun Mei

Pulmonology

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Can influenza-specific drugs prevent influenza?

Influenza is a highly contagious respiratory disease caused by the invasion of the respiratory tract by influenza virus. Clinically, it can be divided into type A influenza and type B influenza based on the specific type of virus infection. Clinically, there are actually no specific drugs for influenza. The key is to provide appropriate antiviral medications for symptomatic treatment. For example, if a patient is infected with the influenza virus, commonly used treatments include traditional Chinese medicines or antiviral drugs, which can effectively alleviate the uncomfortable symptoms caused by the influenza virus. Regardless of which type of influenza virus the patient has, the medications used in clinical treatment cannot prevent influenza. Therefore, we recommend avoiding going out as much as possible during the peak season of influenza. If going out is necessary, it is important to take precautions, as influenza is transmitted through respiratory droplets. Wearing a mask when going outside can reduce the chances of getting infected with influenza.

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How many days does it take to recover from the flu?

Influenza is primarily a disease caused by an infection of the upper respiratory tract with the influenza virus. It is a contagious disease that can spread among people, leading to an outbreak. Although influenza is a frightening illness, it is a viral infection characterized by being self-limiting, meaning that whether or not medication is used, the patient's condition can improve on its own. Typically, the course of influenza can improve on its own within about 7 to 10 days. At this time, it is sufficient to use medications that reduce fever, relieve pain, or treat nasal congestion and coughing, since patients generally recover on their own after about 7 days, and medication is only needed to alleviate symptoms. (Please use medication under the guidance of a doctor.)

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Is the flu easily contagious?

Influenza, also known as the flu, is an acute respiratory infectious disease caused by the influenza virus. Typically, it starts suddenly with symptoms such as high fever, headache, fatigue, conjunctivitis, and widespread muscle pain. Respiratory symptoms like sneezing, nasal congestion, and runny nose are relatively mild in comparison. The flu is mainly transmitted through contact and airborne droplets, and it is highly contagious among the general population. It also has a high incidence rate and can lead to outbreaks; if not properly controlled, it can pose a severe threat to human life.

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Pulmonology

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What department should I go to for the flu?

Influenza refers to a disease that manifests as cough, fever, and sore throat following human infection by the influenza virus. It is commonly known as the flu or influenza. In addition to respiratory symptoms, the flu may also present with digestive symptoms such as nausea, vomiting, abdominal pain, and diarrhea. Therefore, for flu treatment, one can visit the respiratory department. Of course, in cases of severe symptoms such as high fever, chest tightness, and fatigue, one may also visit the emergency department. However, if the initial diagnosis is predominantly digestive symptoms, it's possible that the gastroenterology department will refer the patient back to the respiratory department for treatment. This requires careful differentiation and exclusion by the doctor before making a diagnosis, so visiting the respiratory or emergency department for flu is appropriate.

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What is type B influenza?

Type B influenza is a type of epidemic influenza characterized by a rapid onset, feeling feverish and chilled. Body temperature usually rises quickly within hours, reaching 39 to 40 degrees Celsius, or even higher. It is accompanied by headache, general body aches, fatigue, and reduced appetite. Its respiratory symptoms are relatively mild, including dry throat, sore throat, dry cough, and possibly diarrhea. Type B influenza is difficult to distinguish from the common cold and typically requires laboratory identification for diagnosis.